In the last week or two I've noticed, on more than one SE site, that I'm no longer getting those banner notices for newly-earned badges or privileges. I've seen this on both Firefox 12.0 on OS 10.6 and Firefox 3.6 on Windows XP. It is possible that this is due to some plugin or browser update suddenly deciding that those are no good, but I haven't installed any new plugins lately nor made any more restrictive. (Also, that ancient FF version on XP is a work machine and browser updates are disabled, though plugins update.) I run with NoScript (my SE sites are white-listed), AdBlock Plus, and several that should be irrelevant.
Is anybody else seeing this -- or not seeing it, i.e. you're seeing these notifications?